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The effect of a CaCl2-based accelerator on alkali silica reaction

✍ Scribed by H. Wang; J.E. Gillott

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 357 KB
Volume: 20
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(90)90026-t

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✦ Synopsis

Mortar bars containing a commercial accelerator and using opal as reactive component have been measured for expansion due to alkali silica reaction up to a total age of 18 months. Ultimate expansion for bars containing 2% opal plus accelerator reached 2.18% -61% greater than the control bars (without accelerator).

When silica fume was incorporated in the bars, in amounts of up to 12%, it failed to effectively control the expansion.

At the level of 24% replacement of cement with silica fume, no expansion was registered either with or without accelerator up to an age of 18 months. Results are discussed in terms of the microstructure and physlcochemical properties of the mortar bars.

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